Annotation of src/usr.bin/cal/cal.c, Revision 1.31
1.31 ! cheloha 1: /* $OpenBSD: cal.c,v 1.30 2015/10/09 01:37:06 deraadt Exp $ */
1.1 deraadt 2: /* $NetBSD: cal.c,v 1.6 1995/03/26 03:10:24 glass Exp $ */
3:
4: /*
5: * Copyright (c) 1989, 1993, 1994
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Kim Letkeman.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
1.9 millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #include <sys/types.h>
37:
38: #include <ctype.h>
39: #include <err.h>
40: #include <stdio.h>
41: #include <stdlib.h>
42: #include <string.h>
43: #include <time.h>
44: #include <unistd.h>
45:
46: #define THURSDAY 4 /* for reformation */
1.14 deraadt 47: #define SATURDAY 6 /* 1 Jan 1 was a Saturday */
1.1 deraadt 48:
1.14 deraadt 49: #define FIRST_MISSING_DAY 639799 /* 3 Sep 1752 */
50: #define NUMBER_MISSING_DAYS 11 /* 11 day correction */
1.1 deraadt 51:
52: #define MAXDAYS 42 /* max slots in a month array */
53: #define SPACE -1 /* used in day array */
54:
1.13 tedu 55: static const int days_in_month[2][13] = {
1.1 deraadt 56: {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
57: {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
58: };
59:
1.22 pyr 60: const int sep1752s[MAXDAYS] = {
1.1 deraadt 61: SPACE, SPACE, 1, 2, 14, 15, 16,
62: 17, 18, 19, 20, 21, 22, 23,
63: 24, 25, 26, 27, 28, 29, 30,
64: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
65: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
66: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
1.22 pyr 67: }, sep1752m[MAXDAYS] = {
68: SPACE, 1, 2, 14, 15, 16, 17,
69: 18, 19, 20, 21, 22, 23, 24,
70: 25, 26, 27, 28, 29, 30, SPACE,
71: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
72: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
73: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
74: }, sep1752js[MAXDAYS] = {
1.1 deraadt 75: SPACE, SPACE, 245, 246, 258, 259, 260,
76: 261, 262, 263, 264, 265, 266, 267,
77: 268, 269, 270, 271, 272, 273, 274,
78: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
79: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
80: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
1.22 pyr 81: }, sep1752jm[MAXDAYS] = {
82: SPACE, 245, 246, 258, 259, 260, 261,
83: 262, 263, 264, 265, 266, 267, 268,
84: 269, 270, 271, 272, 273, 274, SPACE,
85: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
86: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
87: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
1.1 deraadt 88: }, empty[MAXDAYS] = {
89: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
90: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
91: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
92: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
93: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
94: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
95: };
96:
1.13 tedu 97: const char *month_names[12] = {
1.1 deraadt 98: "January", "February", "March", "April", "May", "June",
99: "July", "August", "September", "October", "November", "December",
100: };
101:
1.22 pyr 102: #define DAY_HEADINGS_S "Su Mo Tu We Th Fr Sa"
103: #define DAY_HEADINGS_M "Mo Tu We Th Fr Sa Su"
104: #define DAY_HEADINGS_JS " Su Mo Tu We Th Fr Sa"
105: #define DAY_HEADINGS_JM " Mo Tu We Th Fr Sa Su"
106:
107: const int *sep1752 = NULL;
108: const char *day_headings = NULL;
1.1 deraadt 109:
110: /* leap year -- account for gregorian reformation in 1752 */
111: #define leap_year(yr) \
112: ((yr) <= 1752 ? !((yr) % 4) : \
1.5 deraadt 113: (!((yr) % 4) && ((yr) % 100)) || !((yr) % 400))
1.1 deraadt 114:
115: /* number of centuries since 1700, not inclusive */
116: #define centuries_since_1700(yr) \
117: ((yr) > 1700 ? (yr) / 100 - 17 : 0)
118:
119: /* number of centuries since 1700 whose modulo of 400 is 0 */
120: #define quad_centuries_since_1700(yr) \
121: ((yr) > 1600 ? ((yr) - 1600) / 400 : 0)
122:
123: /* number of leap years between year 1 and this year, not inclusive */
124: #define leap_years_since_year_1(yr) \
125: ((yr) / 4 - centuries_since_1700(yr) + quad_centuries_since_1700(yr))
126:
127: int julian;
1.22 pyr 128: int mflag = 0;
1.23 pyr 129: int wflag = 0;
1.1 deraadt 130:
1.7 millert 131: void ascii_day(char *, int);
1.13 tedu 132: void center(const char *, int, int);
1.7 millert 133: void day_array(int, int, int *);
134: int day_in_week(int, int, int);
135: int day_in_year(int, int, int);
1.23 pyr 136: int week(int, int, int);
1.24 otto 137: int isoweek(int, int, int);
1.7 millert 138: void j_yearly(int);
139: void monthly(int, int);
140: void trim_trailing_spaces(char *);
141: void usage(void);
142: void yearly(int);
1.13 tedu 143: int parsemonth(const char *);
1.1 deraadt 144:
145: int
1.10 deraadt 146: main(int argc, char *argv[])
1.1 deraadt 147: {
148: struct tm *local_time;
149: time_t now;
150: int ch, month, year, yflag;
1.20 tedu 151: const char *errstr;
1.29 deraadt 152:
1.30 deraadt 153: if (pledge("stdio", NULL) == -1)
154: err(1, "pledge");
1.1 deraadt 155:
1.6 deraadt 156: yflag = year = 0;
1.23 pyr 157: while ((ch = getopt(argc, argv, "jmwy")) != -1)
1.1 deraadt 158: switch(ch) {
159: case 'j':
160: julian = 1;
161: break;
1.22 pyr 162: case 'm':
163: mflag = 1;
164: break;
1.23 pyr 165: case 'w':
166: wflag = 1;
167: break;
1.1 deraadt 168: case 'y':
169: yflag = 1;
170: break;
171: default:
172: usage();
173: }
174: argc -= optind;
175: argv += optind;
176:
1.23 pyr 177: if (julian && wflag)
178: usage();
179:
1.22 pyr 180: day_headings = DAY_HEADINGS_S;
181: sep1752 = sep1752s;
182: if (mflag && julian) {
183: sep1752 = sep1752jm;
184: day_headings = DAY_HEADINGS_JM;
185: } else if (mflag) {
186: sep1752 = sep1752m;
187: day_headings = DAY_HEADINGS_M;
188: } else if (julian) {
189: sep1752 = sep1752js;
190: day_headings = DAY_HEADINGS_JS;
191: }
192:
1.1 deraadt 193: month = 0;
194: switch(argc) {
195: case 2:
1.12 tedu 196: month = parsemonth(*argv++);
197: if (!month)
198: errx(1, "Unable to parse month");
1.1 deraadt 199: /* FALLTHROUGH */
200: case 1:
1.26 deraadt 201: if (argc == 1 && !isdigit((unsigned char)*argv[0])) {
1.12 tedu 202: month = parsemonth(*argv);
203: if (!month)
204: errx(1, "illegal year value: use 1-9999");
205: (void)time(&now);
206: local_time = localtime(&now);
1.28 millert 207: year = local_time->tm_year + 1900;
1.12 tedu 208: } else {
1.20 tedu 209: year = strtonum(*argv, 1, 9999, &errstr);
210: if (errstr)
1.12 tedu 211: errx(1, "illegal year value: use 1-9999");
212: }
1.1 deraadt 213: break;
214: case 0:
215: (void)time(&now);
216: local_time = localtime(&now);
1.28 millert 217: year = local_time->tm_year + 1900;
1.1 deraadt 218: if (!yflag)
219: month = local_time->tm_mon + 1;
220: break;
221: default:
222: usage();
223: }
224:
225: if (month)
226: monthly(month, year);
227: else if (julian)
228: j_yearly(year);
229: else
230: yearly(year);
231: exit(0);
232: }
233:
234: #define DAY_LEN 3 /* 3 spaces per day */
235: #define J_DAY_LEN 4 /* 4 spaces per day */
236: #define WEEK_LEN 20 /* 7 * 3 - one space at the end */
1.23 pyr 237: #define WEEKNUMBER_LEN 5 /* 5 spaces per week number */
1.1 deraadt 238: #define J_WEEK_LEN 27 /* 7 * 4 - one space at the end */
239: #define HEAD_SEP 2 /* spaces between day headings */
240: #define J_HEAD_SEP 2
241:
1.23 pyr 242: int
243: week(int day, int month, int year)
244: {
245: int yearday;
246: int firstweekday;
247: int weekday;
248: int firstday;
249: int firstsunday;
250: int shift;
1.24 otto 251:
252: if (mflag)
253: return isoweek(day, month, year);
1.23 pyr 254:
255: yearday = day_in_year(day, month, year);
256: firstweekday = day_in_week(1, 1, year) + 1;
257: weekday = day_in_week(day, month, year) + 1;
1.24 otto 258: firstday = day_in_year(1, 1, year);
1.23 pyr 259: firstsunday = firstday + (8 - firstweekday);
260:
261: shift = 1;
262: if (yearday < firstsunday)
263: return (1);
264: if (firstweekday > THURSDAY - 1)
265: shift = 2;
266: return ((((yearday + 1) - (weekday - 1)) / 7) + shift);
267: }
268:
1.24 otto 269: int
270: isoweek(int day, int month, int year)
271: {
272: /* http://www.tondering.dk/claus/cal/node8.html */
273: int a, b, c, s, e, f, g, d, n;
274:
275: a = month <= 2 ? year - 1 : year;
276: b = a/4 - a/100 + a/400;
277: c = (a-1)/4 - (a-1)/100 + (a-1)/400;
278: s = b - c;
279: if (month <= 2) {
280: e = 0;
281: f = day - 1 + 31 * (month-1);
282: } else {
283: e = s + 1;
284: f = day + ((153 * (month-3) + 2) / 5) + 58 + s;
285: }
286: g = (a + b) % 7;
287: d = (f + g - e) % 7;
288: n = f + 3 - d;
289:
290: if (n < 0)
291: return 53 - (g - s) / 5;
292: else if (n > 364 + s)
293: return 1;
294: else
295: return n/7 + 1;
296: }
297:
1.1 deraadt 298: void
1.10 deraadt 299: monthly(int month, int year)
1.1 deraadt 300: {
1.23 pyr 301: int col, row, len, days[MAXDAYS], firstday;
1.1 deraadt 302: char *p, lineout[30];
303:
304: day_array(month, year, days);
1.19 ray 305: (void)snprintf(lineout, sizeof(lineout), "%s %d",
1.8 deraadt 306: month_names[month - 1], year);
1.11 deraadt 307: len = strlen(lineout);
1.1 deraadt 308: (void)printf("%*s%s\n%s\n",
309: ((julian ? J_WEEK_LEN : WEEK_LEN) - len) / 2, "",
1.22 pyr 310: lineout, day_headings);
1.1 deraadt 311: for (row = 0; row < 6; row++) {
1.23 pyr 312: firstday = SPACE;
1.1 deraadt 313: for (col = 0, p = lineout; col < 7; col++,
1.23 pyr 314: p += julian ? J_DAY_LEN : DAY_LEN) {
315: if (firstday == SPACE && days[row * 7 + col] != SPACE)
316: firstday = days[row * 7 + col];
1.1 deraadt 317: ascii_day(p, days[row * 7 + col]);
1.23 pyr 318: }
1.1 deraadt 319: *p = '\0';
320: trim_trailing_spaces(lineout);
1.23 pyr 321: (void)printf("%-20s", lineout);
322: if (wflag && firstday != SPACE)
1.24 otto 323: printf(" [%2d]", week(firstday, month, year));
1.23 pyr 324: printf("\n");
1.1 deraadt 325: }
326: }
327:
328: void
1.10 deraadt 329: j_yearly(int year)
1.1 deraadt 330: {
331: int col, *dp, i, month, row, which_cal;
332: int days[12][MAXDAYS];
333: char *p, lineout[80];
334:
1.19 ray 335: (void)snprintf(lineout, sizeof(lineout), "%d", year);
1.1 deraadt 336: center(lineout, J_WEEK_LEN * 2 + J_HEAD_SEP, 0);
337: (void)printf("\n\n");
338: for (i = 0; i < 12; i++)
339: day_array(i + 1, year, days[i]);
340: (void)memset(lineout, ' ', sizeof(lineout) - 1);
341: lineout[sizeof(lineout) - 1] = '\0';
342: for (month = 0; month < 12; month += 2) {
343: center(month_names[month], J_WEEK_LEN, J_HEAD_SEP);
344: center(month_names[month + 1], J_WEEK_LEN, 0);
1.22 pyr 345: (void)printf("\n%s%*s%s\n", day_headings,
346: J_HEAD_SEP, "", day_headings);
347:
1.1 deraadt 348: for (row = 0; row < 6; row++) {
349: for (which_cal = 0; which_cal < 2; which_cal++) {
350: p = lineout + which_cal * (J_WEEK_LEN + 2);
351: dp = &days[month + which_cal][row * 7];
352: for (col = 0; col < 7; col++, p += J_DAY_LEN)
353: ascii_day(p, *dp++);
354: }
355: *p = '\0';
356: trim_trailing_spaces(lineout);
357: (void)printf("%s\n", lineout);
358: }
359: }
360: (void)printf("\n");
361: }
362:
363: void
1.10 deraadt 364: yearly(int year)
1.1 deraadt 365: {
1.23 pyr 366: int col, *dp, i, month, row, which_cal, week_len, wn, firstday;
1.1 deraadt 367: int days[12][MAXDAYS];
1.23 pyr 368: char *p, lineout[81];
1.1 deraadt 369:
1.23 pyr 370: week_len = WEEK_LEN;
371: if (wflag)
372: week_len += WEEKNUMBER_LEN;
1.19 ray 373: (void)snprintf(lineout, sizeof(lineout), "%d", year);
1.23 pyr 374: center(lineout, week_len * 3 + HEAD_SEP * 2, 0);
1.1 deraadt 375: (void)printf("\n\n");
376: for (i = 0; i < 12; i++)
377: day_array(i + 1, year, days[i]);
378: (void)memset(lineout, ' ', sizeof(lineout) - 1);
379: lineout[sizeof(lineout) - 1] = '\0';
380: for (month = 0; month < 12; month += 3) {
1.23 pyr 381: center(month_names[month], week_len, HEAD_SEP);
382: center(month_names[month + 1], week_len, HEAD_SEP);
383: center(month_names[month + 2], week_len, 0);
1.22 pyr 384: (void)printf("\n%s%*s%s%*s%s\n", day_headings,
1.23 pyr 385: HEAD_SEP + (wflag ? WEEKNUMBER_LEN : 0), "", day_headings,
386: HEAD_SEP + (wflag ? WEEKNUMBER_LEN : 0), "", day_headings);
1.22 pyr 387:
1.1 deraadt 388: for (row = 0; row < 6; row++) {
389: for (which_cal = 0; which_cal < 3; which_cal++) {
1.23 pyr 390: p = lineout + which_cal * (week_len + 2);
391:
1.1 deraadt 392: dp = &days[month + which_cal][row * 7];
1.23 pyr 393: firstday = SPACE;
394: for (col = 0; col < 7; col++, p += DAY_LEN) {
395: if (firstday == SPACE && *dp != SPACE)
396: firstday = *dp;
1.1 deraadt 397: ascii_day(p, *dp++);
1.23 pyr 398: }
399: if (wflag && firstday != SPACE) {
1.24 otto 400: wn = week(firstday,
1.23 pyr 401: month + which_cal + 1, year);
402: (void)snprintf(p, 5, "[%2d]", wn);
403: p += strlen(p);
404: *p = ' ';
405: } else
406: memset(p, ' ', 4);
1.1 deraadt 407: }
408: *p = '\0';
409: trim_trailing_spaces(lineout);
410: (void)printf("%s\n", lineout);
411: }
412: }
413: (void)printf("\n");
414: }
415:
416: /*
417: * day_array --
418: * Fill in an array of 42 integers with a calendar. Assume for a moment
419: * that you took the (maximum) 6 rows in a calendar and stretched them
420: * out end to end. You would have 42 numbers or spaces. This routine
421: * builds that array for any month from Jan. 1 through Dec. 9999.
422: */
423: void
1.10 deraadt 424: day_array(int month, int year, int *days)
1.1 deraadt 425: {
426: int day, dw, dm;
427:
428: if (month == 9 && year == 1752) {
1.22 pyr 429: memmove(days, sep1752, MAXDAYS * sizeof(int));
1.1 deraadt 430: return;
431: }
432: memmove(days, empty, MAXDAYS * sizeof(int));
433: dm = days_in_month[leap_year(year)][month];
1.22 pyr 434: dw = day_in_week(mflag?0:1, month, year);
1.1 deraadt 435: day = julian ? day_in_year(1, month, year) : 1;
436: while (dm--)
437: days[dw++] = day++;
438: }
439:
440: /*
441: * day_in_year --
442: * return the 1 based day number within the year
443: */
444: int
1.10 deraadt 445: day_in_year(int day, int month, int year)
1.1 deraadt 446: {
447: int i, leap;
448:
449: leap = leap_year(year);
450: for (i = 1; i < month; i++)
451: day += days_in_month[leap][i];
452: return (day);
453: }
454:
455: /*
456: * day_in_week
457: * return the 0 based day number for any date from 1 Jan. 1 to
458: * 31 Dec. 9999. Assumes the Gregorian reformation eliminates
459: * 3 Sep. 1752 through 13 Sep. 1752. Returns Thursday for all
460: * missing days.
461: */
462: int
1.10 deraadt 463: day_in_week(int day, int month, int year)
1.1 deraadt 464: {
465: long temp;
466:
467: temp = (long)(year - 1) * 365 + leap_years_since_year_1(year - 1)
468: + day_in_year(day, month, year);
469: if (temp < FIRST_MISSING_DAY)
470: return ((temp - 1 + SATURDAY) % 7);
471: if (temp >= (FIRST_MISSING_DAY + NUMBER_MISSING_DAYS))
472: return (((temp - 1 + SATURDAY) - NUMBER_MISSING_DAYS) % 7);
473: return (THURSDAY);
474: }
475:
476: void
1.10 deraadt 477: ascii_day(char *p, int day)
1.1 deraadt 478: {
479: int display, val;
1.13 tedu 480: static const char *aday[] = {
1.1 deraadt 481: "",
482: " 1", " 2", " 3", " 4", " 5", " 6", " 7",
483: " 8", " 9", "10", "11", "12", "13", "14",
484: "15", "16", "17", "18", "19", "20", "21",
485: "22", "23", "24", "25", "26", "27", "28",
486: "29", "30", "31",
487: };
488:
489: if (day == SPACE) {
490: memset(p, ' ', julian ? J_DAY_LEN : DAY_LEN);
491: return;
492: }
493: if (julian) {
1.5 deraadt 494: val = day / 100;
495: if (val) {
1.1 deraadt 496: day %= 100;
497: *p++ = val + '0';
498: display = 1;
499: } else {
500: *p++ = ' ';
501: display = 0;
502: }
503: val = day / 10;
504: if (val || display)
505: *p++ = val + '0';
506: else
507: *p++ = ' ';
508: *p++ = day % 10 + '0';
509: } else {
510: *p++ = aday[day][0];
511: *p++ = aday[day][1];
512: }
513: *p = ' ';
514: }
515:
516: void
1.10 deraadt 517: trim_trailing_spaces(char *s)
1.1 deraadt 518: {
519: char *p;
520:
521: for (p = s; *p; ++p)
522: continue;
1.26 deraadt 523: while (p > s && isspace((unsigned char)*--p))
1.1 deraadt 524: continue;
525: if (p > s)
526: ++p;
527: *p = '\0';
528: }
529:
530: void
1.13 tedu 531: center(const char *str, int len, int separate)
1.1 deraadt 532: {
533:
534: len -= strlen(str);
1.21 tom 535: (void)printf("%*s%s%*s", len / 2, "", str,
536: len / 2 + len % 2 + separate, "");
1.1 deraadt 537: }
538:
539: void
1.10 deraadt 540: usage(void)
1.1 deraadt 541: {
542:
1.23 pyr 543: (void)fprintf(stderr, "usage: cal [-jmwy] [month] [year]\n");
1.1 deraadt 544: exit(1);
1.12 tedu 545: }
546:
547: int
548: parsemonth(const char *s)
549: {
1.15 deraadt 550: struct tm tm;
551: char *cp;
1.12 tedu 552: int v;
553:
554: v = (int)strtol(s, &cp, 10);
1.17 tom 555: if (*cp != '\0') { /* s wasn't purely numeric */
556: v = 0;
557: if ((cp = strptime(s, "%b", &tm)) != NULL && *cp == '\0')
558: v = tm.tm_mon + 1;
559: }
1.15 deraadt 560: if (v <= 0 || v > 12)
1.17 tom 561: errx(1, "invalid month: use 1-12 or a name");
1.15 deraadt 562: return (v);
1.1 deraadt 563: }
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